Download scientific diagram | XAFS measurements of different samples at the Cr K-edge a XANES spectra. The inset displays a magnified view of the pre-edge peak A. bk³-weighted FT-EXAFS spectra...

Cr K-edge XAFS primarily probes the 1sÆ4p transition (empty DOS), as can be seen from the Cr p DOS and the negative 2nd derivative spectrum. For the CrCl3([9]-aneS3) the Cr p is overlapping with the Cr d, S p and Cl p, indicating that these ligands are reflected in …

1997年8月1日 · Synchrotron-based X-ray absorption fine structure (XAFS) spectroscopy was used to investigate the reduction of aqueous Cr (VI) to Cr (III) in magnetite-bearing soils from Cr-contaminated sites.

2025年3月5日 · 线偏振是椭圆偏振的一种特殊形式，当两个电场分量没有相位差时，电场矢量在同一平面内振荡，如果沿传播方向看，电场矢量端点轨迹轮廓为一条直线。 如果两个分量具有相同的幅度，这就是下图所示的 45°线性偏振。 图1 45°线性偏振. 若某一配位原子与中央吸收原子的配位键与电矢量振动方向是平行的，则由此配位散射原子引起的EXAFS信号就强；若连线与电矢量方向垂直，则此配位原子引起的EXAFS信号就弱。 若入射光束以与样品表面近平行的方向入射， …

2011年2月10日 · We present XAFS evidence for the reduction of Cr (VI) to Cr (III) after reaction with the Fe (Il)-bearing oxide magnetite, Fe 3 O 4, and show that Cr associated with magnetite in soils is reduced, whereas that associated with non-Fe (II)-bearing silicate minerals is not.

XAFS 提供了将多个氧气压计（例如，Ti、Cr 和 V 价代理）应用于单个、潜在分区的矿物颗粒的能力。 挑战包括取向效应的校正、X 射线束引起的修改以及特定价分配系数测量的稀缺性。

2023年6月2日 · Cr doping into the crystalline framework of iron oxide dendrites improves the stability of the structural transformation of iron oxides. We spatially visualized the FeO x …

The synchrotron XAFS analytical results confirms the effect of increasing pH (i.e. Alkalinity) as controlling factor in Cr (VI) reduction process. EXAFS analysis provides evidences that Cr have been captured inside carbonate minerals formed due to hydration process mainly dominated by calcite, ettringite and portlandite.

2011年2月10日 · We present XAFS evidence for the reduction of Cr (VI) to Cr (III) after reaction with the Fe (II)-bearing oxide magnetite, Fe 3 O 4, and show that Cr associated with magnetite in soils is reduced, whereas that associated with non-Fe (II)-bearing silicate minerals is not.

软x射线XAFS简介 在软x 射线波段(100~2000eV),吸收谱研究工作主要集中在: 、C、N、O 等轻元素的K 边; C 的K 边~280eV N 的K 边~390eV O 的的K 边边~530eV 、钛、钒、铁、锰等过渡 …